Diplocat website, 2017
http://www.diplocat.cat/files/docs/170426_E03EN_IsSpainAFederalCountry.pdf
Also published in 50 Shades of federalism, http://50shadesoffederalism, October 2017
There are also translations into French, Catalan and Spanish in the Diplocat website

Democracy and Borders : External and Internal Secession in the EU"

Euborders WP, IBEI, n. 14, 2017 (with K.J.Nagel)

Secession theories and processes in plurinational democracies",

RIEV, n. 11, 2016: 79-92

Secession and liberal democracy: the Catalan case"

Politics in Spires, University of Cambridge-University of Oxford, March 2015,
(previous version published in Diplomatist, New Dehli, India, vol 3, Issue n. 1, 2015